MO-Clamp 3051 T-Top Anchor Pot - An anchoring system for versatile pulling. Insert 3/8" frame straightening chain, anchor with lock cap, and pull from any direction or angle. Lock cap keeps out dirt and dust when not in use. Includes sleeve and lock cap. 3-1/2" (89mm) cored hole required. 3060 Cast-in Model is available for new floors.